There's a script in the Demo Palette that scales a comp. Go to File>Scripts>Demo Palette. Then open up your comp, select it, and choose Scale Composition. You can also go directly to the ScaleComp.jsx
To adjust the timing of the keyframes in a layer select the property in the timeline so all keyframes are highlighted. Then hold down the Alt/Option key, grab the last keyframe in the sequence and drag. All of this stuff is right there in the help files. All you need to do is search.
Scale Composition from Help: It's the bottom bullet point in the first section.
Expand or Contract a group of keyframes: It's right there at the bottom of the page under a bold heading.
The help files are much faster than asking a question on this forum and there's a lot of good info there.
Cheers Rick! You're a mine of information.
The problem with help files is knowing where to look...